/* compare.c -- 该程序可以正常运行 */
#include <stdio.h>
#include <string.h> // strcmp()函数的原型在该头文件中
#define ANSWER "Grant"
#define SIZE 40
char *s_gets(char *st, int n);
int main(void)
{
    char
    try
        [SIZE];
    puts("Who is buried in Grant's tomb?");
    s_gets(try, SIZE);
    while (strcmp(try, ANSWER) != 0)
    {
        puts("No, that's wrong. Try again.");
        s_gets(try, SIZE);
    }
    puts("That's right!");
    return 0;
}
char *s_gets(char *st, int n)
{
    char *ret_val;
    int i = 0;
    ret_val = fgets(st, n, stdin);
    if (ret_val)
    {
        while (st[i] != '\n' && st[i] != '\0')
            i++;
        if (st[i] == '\n')
            st[i] = '\0';
        else
            while (getchar() != '\n')
                continue;
    }
    return ret_val;
}